I think___he said is wrong填that还是what?

I think___he said is wrong
填that还是what?

首先要搞清楚的是 这是什么从句 如果是宾语从句那么就用标志性的What 如果是定语从句 这里就用that 显然这里是宾语从句 因为没有先行词 比如I think the (word)that he said is wrong. word就是先行此 所以 这里是what